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45 ACP Chambered between .450 and .453, only suggested dia. per manual is no more that .451. Use a .452 in the 45 Colt even though the manual suggests .451. In reading, the .452 may not chamber as well as the .451. Are there other concerns with a .452 in a 45 ACP?
 

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I have shot a bunch of .452 hard cast Bullets out of 1911’s.
Jacketed Bullets .451
 

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What are you shooting jacketed, plated, coated, or bare lead?

I’m loading MBC hi-tek coated .452’s and they chamber reliably and shoot well out of my P220 and Colt 1911.
 

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I’m loading MBC hi-tek coated .452’s and they chamber reliably and shoot well out of my P220 and Colt 1911.
Exactly what were loading. New to the Hi-tek coatings, but all of the results on them have come back positive. It was hard not to hook on Xtreme when we could pick them up in Carson City,NV. And the plating was a new thing 16yrs back, well it was for us.
 

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Exactly what were loading. New to the Hi-tek coatings, but all of the results on them have come back positive. It was hard not to hook on Xtreme when we could pick them up in Carson City,NV. And the plating was a new thing 16yrs back, well it was for us.
I have had good luck with them. I have a few thousand of them I am planning to load up and stash away for the foreseeable ammo shortage.

They also require very minimal case mouth flare to avoid shaving. The same projectiles in bare lead required a pretty significant flare to to seat properly. So it looks like the Hi-Tek coating is very hard and may prolong the life of my brass.
 

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As noted, jacketed go 0.451". For coated lead or lead, even plated, go 0.452". I readily admit to never slugging a bore & all I shoot is coated lead in everything. I have measured cyl throats though.
 

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As noted, jacketed go 0.451". For coated lead or lead, even plated, go 0.452". I readily admit to never slugging a bore & all I shoot is coated lead in everything. I have measured cyl throats though.
I've done the same but never found an instant where I needed to change from the rule of thumb.
 

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185 grain .451 nosler HP competition bullets. They look like jewelry.. 4.5 grains titegroup. Tiny little groups. Less recoil.. very very accurate .

I use them for competition and for instructing.. with 1911's.

Nosler competition hp bullets are very very expensive and very very accurate.
 

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As noted, jacketed go 0.451". For coated lead or lead, even plated, go 0.452". I readily admit to never slugging a bore & all I shoot is coated lead in everything. I have measured cyl throats though.
I've done the same but never found an instant where I needed to change from the rule of thumb.
Yep and if you don't slug, your barrel will typically tell you if you need more diameter with cast.
 

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I've done the same but never found an instant where I needed to change from the rule of thumb.
I only measure cyl throats because i have had them 0.002" too small. So they get opened up.
My RBH ss was the worst at 0.4505" cyl throats. Running 0.452" bullets was just wasting time. Once thr throats were opened, accuracy was 50% better & any leading went away.
 
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