ASSRA Forum - Should cases be resized for best accuracy

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Should cases be resized for best accuracy (Read 2085 times)

MartiniBelgian Frequent Elocutionist Offline Posts: 1714 Location: Aarschot Joined: Jun 7^th, 2004	Re: Should cases be resized for best accuracy Reply #15 - Dec 24^th, 2024 at 5:34am	Print Post
	Some things don' compute - you have blocks for 500m, but you run out of elevation still shooting 7" low? and then you install a lower rear block (which would have you shooting even lower), and you end up 5" high?? Before worrying about a tiny bit of runout, I'd get the rifle set up correctly before going to the range next time - after all, you don't need a range to boresight a rifle. Certainly not with a laser. What about bullet dia. vs. groove dia.? Did you slug the rifle? It's a 38-55...


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boho Full Member Offline Posts: 207 Location: NY New York Joined: Feb 6^th, 2012	Re: Should cases be resized for best accuracy Reply #16 - Dec 24^th, 2024 at 8:37am	Print Post
	Sorry I did change both blocks (3/8”). I didn’t have a set so I believe I used a 5/16 in the rear and a .250 in front. I used what I had on hand. Would that have caused a problem with the laser? Because I know I had the laser dot and crosshairs somewhat lined up.


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boho Full Member Offline Posts: 207 Location: NY New York Joined: Feb 6^th, 2012	Re: Should cases be resized for best accuracy Reply #17 - Dec 24^th, 2024 at 9:38am	Print Post
	I just but this barrel back on the rifle. I really don’t remember so good lately. I had a RKS.40 barrel on it when I shot BPCRS. When I went to a scope there was a problem getting to the rams so I changed one or both blocks. Wouldn’t it make sense that if I used this same set of blocks at 100 yds, that I would run out of adjustment and be hitting 7” low?


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MartiniBelgian Frequent Elocutionist Offline Posts: 1714 Location: Aarschot Joined: Jun 7^th, 2004	Re: Should cases be resized for best accuracy Reply #18 - Dec 24^th, 2024 at 9:41am	Print Post
	If you install new blocks, you'll need to re-sight the rifle, no way around it. Especially elevation would be a potential issue. And the way I read it, you actually raised the rear, not lowered it - relatively speaking. I'd use one of the calculators to see what you'll need to get in order to get elevation more or less centered. I believe brownell's has something.


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MartiniBelgian Frequent Elocutionist Offline Posts: 1714 Location: Aarschot Joined: Jun 7^th, 2004	Re: Should cases be resized for best accuracy Reply #19 - Dec 24^th, 2024 at 9:43am	Print Post
	boho wrote on Dec 24^th, 2024 at 9:38am: I just but this barrel back on the rifle. I really don’t remember so good lately. I had a RKS.40 barrel on it when I shot BPCRS. When I went to a scope there was a problem getting to the rams so I changed one or both blocks. Wouldn’t it make sense that if I used this same set of blocks at 100 yds, that I would run out of adjustment and be hitting 7” low? No - you installed another barrel, probably dimensionally different. And as your scope blocks are on the barrel, you need to redo.


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boho Full Member Offline Posts: 207 Location: NY New York Joined: Feb 6^th, 2012	Re: Should cases be resized for best accuracy Reply #20 - Dec 24^th, 2024 at 10:07am	Print Post
	My last 2 shots were 5” high. Windage was fine. I came down 20 clicks and should now be very close to being sighted in. (I hope) I haven’t gotten a response about the cases not being annealed. Could this cause the run out I am seeing on the fired cases?


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marlinguy Frequent Elocutionist Offline Ballards may be weaker, but they sure are neater! Posts: 16892 Location: Oregon Joined: Feb 2^nd, 2009	Re: Should cases be resized for best accuracy Reply #21 - Dec 24^th, 2024 at 11:13am	Print Post
	With my single shot rifles I simply open the action, and adjust the view down the bore until the target is centered in the bore. Then adjust my scope to see the same. Once done adjusting I raise the elevation adjustment a couple inches to allow for bullet drop and fire three shots. It's almost always very close to where I want to be.

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MartiniBelgian Frequent Elocutionist Offline Posts: 1714 Location: Aarschot Joined: Jun 7^th, 2004	Re: Should cases be resized for best accuracy Reply #22 - Dec 25^th, 2024 at 12:25pm	Print Post
	annealing and runout are the final tweaks in getting the best accuracy from a load/cartridge. When you have alod that shows promise, you try those things for incrementally better accuracy. FWIW, I don't consider that to be significant runout.


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