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When to Size a Bullet (Read 4321 times)

Edward C. Sharps Participating Member Offline Posts: 24 Joined: Apr 13^th, 2016	When to Size a Bullet Jun 28^th, 2016 at 8:41am	Print Post
	Should a bullet be resized if it is .002" larger than the rifle bore? I have never had to consider this because my Saeco 45/70 mould drops bullets at exactly .458 and this works great in my Sharps. Good accuracy and no leading. Lucky. However, I have a 38/55 on the way and I have been told by the manufacturer that the bore is .376. The mould I have on-hand drops bullets right at .378, and they seem to be concentric and not out of round. I know I need to shoot it and see the actual results, but I'd like to hear what experiences others have had in similar circumstances. Thanks Ed


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marlinguy Frequent Elocutionist Online Ballards may be weaker, but they sure are neater! Posts: 18061 Location: Oregon Joined: Feb 2^nd, 2009	Re: When to Size a Bullet Reply #1 - Jun 28^th, 2016 at 10:25am	Print Post
	I prefer bullets to be .001" over, but if my mold drops them .002" over, I always try them first. Sometimes I've had good accuracy and no issues with the .002" over. If it works, then I go with it.

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John Boy Ex Member	Re: When to Size a Bullet Reply #2 - Jun 28^th, 2016 at 12:56pm	Print Post
	Quote: Should a bullet be resized if it is .002" larger than the rifle bore groove diameter? Most 38-55's are 371 land and 378 groove diameters. 0.002" over groove will obturate nicely


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Edward C. Sharps Participating Member Offline Posts: 24 Joined: Apr 13^th, 2016	Re: When to Size a Bullet Reply #3 - Jun 28^th, 2016 at 1:08pm	Print Post
	Thank you all for the kind replies. I should have the gun in another couple weeks. Like waiting for Christmas.


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JLouis Frequent Elocutionist Offline Posts: 10625 Joined: Apr 8^th, 2009	Re: When to Size a Bullet Reply #4 - Jun 28^th, 2016 at 1:15pm	Print Post
	I think it is dependant on some of the various variables. For example my 32-40 barrel now has over 144,000 bullets down the bore. The groove diameter is .3205 but due to throat erosion I now have to use a .325 baseband bullet. The barrel is long over due for a set back or replacement but it still shoots extremely well. It shot a new ASSRA 5-5Shot 100yd Group Average record of .3882 in Oct. of 2013. JLouis

	" It Is Better To Now Have Been A Has Been Than A Never Was Or A Wanna Be "
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svartkruttgris#369 Frequent Elocutionist Offline Posts: 2980 Location: Colorado, Norway, Sweden Joined: Oct 28^th, 2014	Re: When to Size a Bullet Reply #5 - Jun 28^th, 2016 at 3:42pm	Print Post
	For old rifles with eroded throats and first cm of bore, or military rifles from early in nitro-powder era, I have gotten good to excellent groups using well oversize, soft Pb alloy bullets (+/-0,005") over size of original bore. These were hunting rifles but, some would/do produce 1,0" multi-shot groups at 100 yds. Grisen


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SSShooter Frequent Elocutionist Offline Posts: 2942 Location: Southern NJ Joined: Aug 1^st, 2010	Re: When to Size a Bullet Reply #6 - Jun 29^th, 2016 at 6:19am	Print Post
	Quote: Quote: Should a bullet be resized if it is .002" larger than the rifle bore groove diameter? Most 38-55's are 371 land and 378 groove diameters. 0.002" over groove will obturate nicely Not sure about "most", but the 38s I've owned (and still own) are either 0.368" or 0.369" x 0.375", which is what Grn Mtn, Kreiger & Bartlein offer. Not sure about Douglas, etc., but should be listed on their websites.

	Glenn - Stevens 044 1/2, Bartlein SS 5R barrel in 22LR
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bruce moulds Senior Forum Member Offline Posts: 290 Location: the antipodes Joined: Mar 14^th, 2015	Re: When to Size a Bullet Reply #7 - Jun 29^th, 2016 at 4:59pm	Print Post
	ed, are you using black or smokeless? with black, the optimum diameter for a bullet is a neat friction fit as you slide it into a fireformed case with your fingers. the reason for this is that it will become this diameter before it starts to move, and the less it has to upset the better. keep safe, bruce.

	ventum est amicus meus
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Edward C. Sharps Participating Member Offline Posts: 24 Joined: Apr 13^th, 2016	Re: When to Size a Bullet Reply #8 - Jun 29^th, 2016 at 8:10pm	Print Post
	Bruce - I shoot black, but i want to try smokeless just to see how it shoots. It don't resize the brass but I will use a light crimp.


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