6.5 Creedmoor, How to Determine Seating Depth, Loading and Testing.

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After having determined the optimal charge weight for 140 grain sierra match king bullets, we now turn our attention to experimenting with seating depth. We seat the bullets from .008 to .035 off of the lands. We are looking for that optimal, seating depth.
Link to 140 Sierra Match King load development for 6.5 Creedmoor.
• Testing 140 gr. Sierra...

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28 сен 2023

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Комментарии : 11

@outdoorsinontario3037 4 месяца назад

Gr8,,! Very helpful, thank you

@EverydayReloadingandShooting 4 месяца назад

Glad you found it helpful. Thanks for watching.

@lmbear Месяц назад

With most "hunting" bullets, and even most target type bullets, you can start at .020" off the lands, and then work up to OCW, and find a stellar load. Meaning sub 1/2 moa for 5 shots at 100 yards. Doing it this way, you don't waste nearly as many valuable components and you also reduce wear on your barrel.

@EverydayReloadingandShooting Месяц назад

Thanks Bear. With the 140 ELD match loading at the recommended OAL of 2.8"puts me almost exactly .020 off of the lands. Thanks for watching.

@thomaskingsbury6560 6 месяцев назад

I am getting confused when you say coal vs cbto. I thought you measured cbto, so at 20 thou and 23 thou cbto you got the best group size. That is where you lose me because you start saying coal. So did cbto and coal converge at that point?

@EverydayReloadingandShooting 6 месяцев назад

Hi Thomas. That is correct. as it turns out, when you have a cartridge overall length (COAL) of 2.8 inches, that puts you almost exactly 20 thousandths to 23 thousands off of the lands in this rifle. Does that make sense? Thanks for watching.

@thomaskingsbury6560 6 месяцев назад

You would still want to use the cbto as your reference point yes? In my case I took a fired case chambered it and the bolt closed easily. So I used a bushing die and closed the case mouth to the point that a bullet would fit snug enough to stay in place. With the bolt removed I gently pushed the case into the chamber and with a wooden dowel through the muzzle pushed back. There was a bit of resistance so I resized until there was none. So I am not at jam, I measured then deducted 20 thousands back, for cbto. Similar to the exercise you did. 42.5 gns imr 4350 20 thou off lands and groove netted a very tight group at 100 yds. I did do a variety of powder charge and seating depths from the origin measurements and that is what got the best results. I think we are on the same page. Thanks again.

@EverydayReloadingandShooting 6 месяцев назад

It seems like you would want to do that with the bolt, rather than a wooden dowel. The lands and the ogive are sloped so it’s very tricky to know when you’re just touching the lands. You can push a little harder and get jammed into them.

@timothyrichburg7331 6 месяцев назад

Good Job on your analysis! I love your range. Something to consider: Hodgdon and most other bullet manufacturers that publish loading data publish up to the last known good node before you are in high-pressure ranges. So technically, in most cases, the hard work to determine the seating depth has already been calculated. Unless you're going off the grid and finding the best possible node for your rifle per max headspace (which allows for larger charges), which resides at several nodes. My recommendation is to use this video, and you'll get there a whole lot faster: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-oRXlCG9YZbQ.html.

@EverydayReloadingandShooting 6 месяцев назад

You're right. The recommended overall length puts me 20 thousandths off of the lands which gave me my best groups. I will check out that video that you mentioned. Thanks so much for watching.

@EverydayReloadingandShooting 6 месяцев назад

Yes, I go to this range every Wednesday. It is my favorite place to be away from home. I have seen the video by Eric Cortina before. I subscribe to his channel. One of my favorite creators. Thanks for sharing. And thanks again for watching