Another gem from Erik. It's so obvious once you explain it, but never would've thought through it on my own. Thanks Erik!

These videos are incredibly helpful. I have gained so much more understanding of the various processes in reloading than I learned by just reading reloading manuals. Thank you, Eric.

Thanks Eric! That was a great description!

Your a legend mate. I’ve learned so much this last weekend, but opened up so many new questions & ways to think about what’s going on .

Man, you have taught me so much in the handful of videos I've watched. You always break it down in a way that's easy to get.

Mr Cortina you are very knowledgeable and have helped me understand precision handloading more than anyone. Thank You. I can't wait to apply these techniques when my rifle is done 👍

The ore I watch your videos, the more I realize what I don't/didn't know about reloading. Thank you!

Had not focussed on that aspect before . Thanks for the Illustration .

Awesome Erik!! I'm definitely going to look you up and follow you!! Thank you very much for the information you are sharing with us!!!

I was working on a reloading issue for two years. After my first patreon video, Erik’s content solved my issue that I was having. This was worth every penny ive spent on his patreon account. Great video!!!

Good stuff Erik. My reloading process includes annealing and pushing the shoulder back to a certain dimension and seating my bullets to a certain base to ogive dimension. I did not understand what happens if your shoulder bump is inconsistent or what you need to do to your searing depth to correct an inconsistent shoulder bump. Now I do, and it makes perfect sense. But, you are the first person I’ve seen to explain it and I find that very interesting. I’m thinking most people giving reloading advice do not really understand this basic concept, otherwise they would have made a point of explaining it just like you did.

Makes sense to me, Keep them coming Eric!

Great video but even more so, outstanding class Eric! Discovery learning sometimes sucks (20 years ago the hard way). Cost us a match but… please keep teaching us the great techniques.

Excellent presentation Erik, thank you.

Glad your shop is coming along and glad your back sharing the knowledge.

Very well presented topic Eric. Thanks! This also illustrates why using high quality bullets with consistent base to ogive dimension is so important. I just measured some (10 each) Sierra match 69 grain HPBT and some 55 grain Z-Max and they were within the +/- .0005" resolution of my caliper. I also measured some Berry's 55 grain and they varied by as much as .006" base to ogive! Not knocking Berry's...you get what you pay for which is why I use them as trainer rounds in my AR.

I really had not thought about it that way either. But that works out. Thanks for the explanation. I have learned a lot from your videos.

Never thought of this and its great into! Thank you!

Can’t thank this man enough. Having been reloading for 20 years since age 5, I have found I have so much to learn. Can’t believe I’ve been doing it this long and no next to nothing in reloading. Thank you for rekindling my love for reloading man, it went from a chore of quick 1-1.25 inch shooters to less than .5 in rifles with 3-9 shot groups. Now I’m getting into long range with 308,338 lapua and 30-06. Can’t wait to learn more from your vids

Thank you Erik you are awesome!

Thanks man. Glad I found you on YT.

Good contribution. Thank you ... That's why I always measure each finished cartridge and if it is not in the correct dimension, I disassemble and correct ...

Awesome example of above-average intelligence my brother and I have been shooting and doing Precision reloading all of our lives. This example a shoulder bump could possibly be some of our issues we've been having lately. Makes perfect sense. Thank you. Will forward this to my brother.

Welcome back Erik!

That was very well explained, it all makes sence. No more neck sizing, even it is faster, but the accuracy must be the main key, no quantity over quality.

Great video. Thanks for the lesson.

That's really interesting information. I never thought of it. Man you know your stuff. Thanks again.

Ahh! Helps me a lot to understand and that I can do something with the ones I do occasionally bump too far. Thanks for all you do.

Awesome, thanks for explaining this. At first my dyslexic brain though at first you would seat the bullet less deep or longer from case head to Ogive if shoulder is bumped back further than desired. But then it popped in my head that by bumping the shoulder back it allows the case to move forward more before the shoulder hits, this would naturally then also move or push the bullet further into the rifling. And like you said to maintain your off the rifling distance consistent if you bump too far, split the distance of what bump you wanted and what you accidentally got, and then seat the bullet this much deeper into the neck, and then it’s just right. It’s easy to misunderstand some of these relationships and how they effect things. I feel like my blob of grey matter in my head-pan has just grown a couple thousandths of an inch from this video! Thanks Eric ✌️😎👍

Mr. Cortina thanks for your content sir.

Glad to see you are ok Erik

Great explanation, thanks.

Thank you Erik!

I've never thought of it this way, but it definitely makes sense. Thanks Erik 👍👍

Awesome Erik. Thank you

spot on , couldn't be clearer . something i never thought of TBH

That was explained very well, and an eye opener for me, Thank You👍

Thanks for this video, very helpful!

Very impressive and well explained. Thanks for sharing you expertise

Brilliant thanks for the content.

Thank you for this knowledge!

Cool video. Bummer about the reloding stuff though. All the good guys are going to patreon. I don't do patreon unfortunately. Take care Eric! Your videos are great😁👍

I love videos like this!! More please!

Great video!

Thank you! This makes a ton of sense.

Thanks for that, have fun.

Such a good video!!! Thank you!!! I have .23 5 shot groups now because of your videos!!! Much appreciated

Thanks. I understand the concept.

Awesome video Erik

Thanks Eric!

Got it Erik. Thank You!

Makes sense indeed!! Thanks Erik! :D

Good good info, very appreciative. Thank you!

Wowwwwwwww that was some great information. Thanks, brother 🙏

Good visualization and explanation. It’s a topic hard to explain and I’ve wanted to explain it to people and it just never clicked with them. I’ll just share your video.

You will not believe the arguments I've been getting into in my reloading group because of you lol. I've been trying and testing what you do and having good results so I've been posting it. Man do people get mad when you show them full size works better. Then I posted an annealing video that just barely got the neck glowing and they lost their minds so I posted your 20 second test. I can't wait to piss people off with this. Your advice works man, thanks

im learning so much thx

Erik, you literally saved my match Sunday. I accidentally bumped 6 thou on everything I was testing today. After today, I have no time to test before the match. I was able to shoulder bump 2 thou when I got home now and seat the bullets 4 thou deeper than the long end of my seating depth node. THANK YOU

Excellent way to explain this

Makes perfect sense. Thanks!

Appreciate the sharing of knowledge. I had always bumped mine back about .002 , but I also always pushed my bullets about .020 away from the lands. I wasn't chasing the lands, its just where that rifle grouped that load the best. I never thought about the firing pin pushing the brass forward, but I guess it would have to unless you seated the bullet into the lands, and we know thats a really bad idea. :)

Thanks Erik very informative

Excellent observation; something to be aware of when neck sizing. Although most of my brass was of same manufacturer and lot including load component details) changes in seating depth was something I thought would occur anyway. Fortunately, there were no reductions in accuracy. In fact, the spreads may have tightened up. Consistency is preferred. The possibility of requiring the use of similar loads in other guns always makes FL desirable. After listening to your emphasis on the inconsistencies related to neck sizing, I plan to full length size all brass from now on, match rifle or field sporting rifle.

Makes sense and easily understood

Great explanation!

Good piece of the puzzle people overlook and hopefully gets them thinking of brass manufacturer differences and even variance between lots and composition as well projectiles.

Great explanation

This makes great sense! Thank you. I don't compete. Just recreational and hunting stuff. This info will come in Very handy with the lee dies I have. The bump is not consistent. 2, 3, even 4 thou difference from start to finish. Again thank you.

Thanks Erik

Well done sir! You are good at explaining these things. I come from a family of farmers,machinists,and fabricators. We are also pretty good mechanics by necessity but some of this reloading stuff confuses me at times!

Haven't started reloading yet - hoping to be able to get into it next year, and this is priceless. I can just imagine how much time and money I'd have wasted trying to figure out why I wasn't getting consistent groups.

Thanks Eric

Great info.

Good info, thanks.

Learn something new everyday. I would have never even thought about this.

Taking care of yourself and your business is nothing to be sorry for and you are not "hanging us" out to dry. Keep up your work and doing what it is that you need to be doing. Keep on Keeping on.

Pressure signs, increased seating depth and no more flat primers even with increased charge. Totally get it now. Thank you

I have zero competitive shooting experience, only 35 years of reloading 12 different bottleneck cartridges. I get 6 - 10 reloads of the same brass before work hardening of the neck splits during resizing, primer pockets go loose. I've been only neck sizing for decades; outside neck turning is my key to axial alignment. The crush fit of rechambering my brass into my rifles chamber is but a minor extra bit of pressure. There is no .002" to calculate, factor in, figure out, and phlilosophize about. I do work up a note card for each box of loads that includes these measurements: SAAMI OAL, max length in magazine, and length to touch lands. My loads are seated .020" off the lands if the max magazine length allows or .005" less than max mag length. I'd love to dial in a zero at 500yd and try the Blackjack with my .338 Lapua.

Hey Eric, knowing is half the battle…, thanks for sharing your knowledge brother

Thank you Eric it makes perfect sense but I just never thaught of it

Great content

Good explaining! Consistance is the leadword.

That makes total sense! The link you mentioned isn't available since they removed the description.

Great video and so true! I normally check all of my sized case shoulder datums and sort by length...although it generally varies very little. I adjust seating depth accordingly so all bullets have the same jump. Nowwwww....I recently bought the Accuracy One Seating Depth Comparator. What a time saver! This eliminates the need for any sorting as it measures shoulder to bullet ogive which is THE ONLY MEASUREMENT THAT MATTERS ANYWAY! Wish I would have bought it sooner

Firing pin driving case forward but doesn't the ignition drive it back to meet bolt face before bullet leaving? Guess km wrong but that would suggest jump stays same regardless of shoulder bump?

It all makes sense to me! I discovered this back in the 80s when I started reloading. At first I made my cartridges the same length as factory. Then a mentor explained it to me that I wanted the bullet to almost contact the rifling. To measure this length while pushing the cartridge into the chamber and to subtract .001, and the make some .002 etc until I reached consistent the best accuracy. My buddy cannot figure out why my AR of the same make shoots more accurately than his. I am debating whether or not I should tell him😏

I appreciate the way you explain what I'm seeing, but I didn't understand. THANKS

Very interesting, makes 100% sense!

Erik your very smart and have 3+ groups hanging on every word in your videos. The group that pays and the one that your most passionate about are the nail drivers. Me, I'm in the "Side of the Barn" group that's getting ready to order a tuner when I get $ and ammo. Yey! Black Nitride coming to ur PO Soon! The 3rd group has had to be traders and watch Texas Best Construction. It's good to see you teach your passion and just try and throw the rest of us a bone every now and then. Prof Cortina is changing the shooting world.

I love watching this guy he knows his stuff.

Thx for this explaination

Thank you for sharing

Very cool video. Consistency is king! Get it right, then keep it right. Only make adjustments when the need is demonstrated or required.

LOL ERIK it's CBTO. I learn something new every time I watch one of your videos. Thanks for sharing more of your knowledge going to join your Patreno .

I was wondering if this effected the seating depth this has been very very very helpful in validating my theory and now I can reload with a little more confidence its been so hard because the group that I shoot with neck sizes and there all old school

Bingo!!! Houston, the eagle has landed!!! I was reloading and now I understand the whole process. Therefore I do not neck size, so I keep my seating depth consistent!!!💯🤙👍

Mind blowing!!

It makes perfect sense. In machining terms, your case becomes a reference. If it's out a few thou than the product, your accuracy, won't have a common reference. Once that calibrated surface is gone, especially in a worn weapon, your ratios inside the chamber and barrel change. That can change your pressures, burn rates, and everything else. Thanks for making it so simple. Basic math and the white board of knowledge are powerful tools lol.

Ohhhh, l get it now...Thanks Erik

Makes perfect sense!