Large Pistol Magnum Primers


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RVenick
September 11, 2009, 11:14 AM
I would like t know if anyone has any recommendations on using LP Mag Primers in a 45acp. I have read about reducing loads by 10% but, is there anything else I should be aware of? Will there be any performance gain or loss using these primers. I will be probably be using W231 but have some Power Pistol if it is the better powder choice to use with these primers.

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jibbs
September 11, 2009, 11:42 AM
Good question as I am in the same situation (have 3k of LPM and no magnum. I have always wondered. Maybe now I will actually be able to use them.

rcmodel
September 11, 2009, 12:30 PM
Yes, you can use them.

No, there is no need to reduce all loads by 10%.

Only maximum loads will possibly generate higher then safe pressure when switching to Mag primers.

If you are only loading starting - light - mid-range target loads there is no need to reduce further.

In any case, do not reduce any starting load another 10% for any reason.

The only possible ill effect you "might" see is a wider spread in standard deviation and accuracy. But that's only in theory, as I have never tested it myself in .45 ACP.

rc

buck460XVR
September 11, 2009, 02:14 PM
I use the WLP primers(good for mag or standard powders) in my .45ACP and find no difference than when I use standard LP primers. Then again, I do not shoot max loads in my 1911.

RVenick
September 11, 2009, 05:07 PM
Thanks rc I am currently only at about midrange on my loads so I will treat em the same. I have a friend that just got into reloading and I fronted him some powder and 1000 LP primers. We placed an order with PV and all they had was LP magnum primers and I so ordered a 1000 to replace the 1000 I gave him.

tango2echo
September 11, 2009, 06:18 PM
I've been using LPM CCI primers in .45ACP for about 500 rds now, as I have ran short of LP primers. The only difference I have seen is an increase in velocity of about 15-20fps and slightly greater SD. I would suggest reducing max loads by 5%-10% for safety.

t2e

ArchAngelCD
September 12, 2009, 01:23 AM
I've been using LPM CCI primers in .45ACP for about 500 rds now, as I have ran short of LP primers. The only difference I have seen is an increase in velocity of about 15-20fps and slightly greater SD. I would suggest reducing max loads by 5%-10% for safety.

t2e
If you have seen only a 15-20 fps increase in velocity why would you suggest a 5% let alone a 10% reduction in powder charge??? I have found when using a charge of 5.5gr W231 in a 230gr .45 Auto round only a 10 fps difference when using a standard and Magnum primer. That little a difference doesn't even have to be the primer.

IMO the whole standard vs magnum primer thing is way overblown and really a non-issue in handgun rounds. (except when loading high pressure ammo at the top end of the charge range of course)

tango2echo
September 12, 2009, 03:55 AM
If you will re-read the post you will see that I said "when using max loads..." I am not using a maximum load to see only a 15-20fps increase. The OP may, or may not see a much greater increase in both velocity and pressure. For the sake of safety I suggested to the OP to reduce the load. If he chooses to work up from there that's his business, but we must remember that what may be safe and acceptable for one of us may not be for someone else. This is also the reason I did not suggest load data in this case.

t2e

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