X-Treme Bullets Feedback?

[motosapiens]

Mark R, probably need to open the crimp up a bit. Your 10 yard groups look like my 40 yard groups with the same bullet.

If I open up the crimp any more, the bullets will fall out, or worse setback. Very little crimp on all those...maybe .001-.002 at most.

Wait, what? Crimp has an effect on that setback in auto rounds? Are you sure? I always thought it was the sizing that held the bullet in, which is why i only crimp enough to *just* remove the belling. As little as possible and still have them feed. Maybe that's why I get great accuracy in all my guns with extremes; I'm not overcrimping them and damaging the plating so they fly erratically.

[ES13Raven]

These are my first 5 shots ever out of a CZ 75 SP-01 Shadow, using Xtreme 147gr RN at 75 feet from a rest. (Note the group size, not location)

I was sighting the gun in and have since moved the rear sight to the right:

Edited April 15, 2015 by ES13Raven

[tires2burn]

Why do you shoot from 75 feet?

[motosapiens]

Why do you shoot from 75 feet?

It's easier than 25 yards.

[Mark R]

Mark R, probably need to open the crimp up a bit. Your 10 yard groups look like my 40 yard groups with the same bullet.

If I open up the crimp any more, the bullets will fall out, or worse setback. Very little crimp on all those...maybe .001-.002 at most.

Wait, what? Crimp has an effect on that setback in auto rounds? Are you sure? I always thought it was the sizing that held the bullet in, which is why i only crimp enough to *just* remove the belling. As little as possible and still have them feed. Maybe that's why I get great accuracy in all my guns with extremes; I'm not overcrimping them and damaging the plating so they fly erratically.

I doubt setback will occur since the sizing should take care of that. I was trying to iterate that I have very little crimp. Like you said...just enough to remove the bell for seating.

[thermobollocks]

Why do you shoot from 75 feet?

'Cause there's sadists like me who will build a course with 30 yard KD plates.

[tires2burn]

My max is about 30 feet.

[rtp]

I'm running N320 3.4 OL 1.3-1.4 and "crimp" .375 Honestly I'm confused with this crimp issue...I was taught it is a specific measurement not a subjective light/tight ?

We carefully measure everything else: OAL, powder grains, bullet diameter etc. Why wouldn't we measure crimp?

.375 sounds like too much crimp to me. I use Xtreme 147 RN as well, and try to set my crimp at .378 / .379

Easy way to measure:

measure case wall thickness, * 2.

Measure bullet diameter at approx. point of contact with case mouth.

Add the two together, and subtract 0 to ~.001 at most.

There's your finished round at case mouth target measurement, typically ~.377-.378 for most 9mm case/bullet combos.

[wblacksh]

I have been loading the 124 gr RN xtreme bullets and this is my results with 2 different guns and 2 different loads (a major PF load and a minor PF load):

at 125 powerfactor out of my M&P accuracy is 14" groups at 50 yards

at 125 powerfactor out of my M&P accuracy is 2" groups at 20 yards

at 173 powerfactor out of my open gun, I get 2" groups at 20 yards.

the same minor PF loads in my open gun accuracy at 50 yards is about the same as with the M&P

at 173 powerfactor out of my open gun, accuracy at 50 yards is terrible. I cant even hit the 12 inch circle. The shots miss by several feet sometimes left right up and down in a random pattern. My dot is in the same place every shot.

I think the speed of major power factor with these degrades accuracy severely. I have about 2500 of them left and will use them up. I bought a bunch because of the price point. I plan to try something else when my stock runs out. My crimp seems to be correct after a few adjustments and tests.

The current load I am using works for me at the moment as most of the targets I shoot at in matches are < 25 yards.

Thanks.

[lawmangr]

I have been loading the 124 gr RN xtreme bullets and this is my results with 2 different guns and 2 different loads (a major PF load and a minor PF load):

at 125 powerfactor out of my M&P accuracy is 14" groups at 50 yards

at 125 powerfactor out of my M&P accuracy is 2" groups at 20 yards

at 173 powerfactor out of my open gun, I get 2" groups at 20 yards.

the same minor PF loads in my open gun accuracy at 50 yards is about the same as with the M&P

at 173 powerfactor out of my open gun, accuracy at 50 yards is terrible. I cant even hit the 12 inch circle. The shots miss by several feet sometimes left right up and down in a random pattern. My dot is in the same place every shot.

I think the speed of major power factor with these degrades accuracy severely. I have about 2500 of them left and will use them up. I bought a bunch because of the price point. I plan to try something else when my stock runs out. My crimp seems to be correct after a few adjustments and tests.

The current load I am using works for me at the moment as most of the targets I shoot at in matches are < 25 yards.

Thanks.

Did you mean 4" groups at 50 yards? 14" groups seems like quite a spread.

I've reloaded about 2,500-3,000 rounds using Xtreme 115gr plated 9mm. Shoot them out of both a STI Trojan and a STI Steelmaster. I can regularly have 2-3" groups at 25 yards offhand. Easily 2" from a rest at the same distance. Farthest I've shot them from so far was 40 yards and they were 3-4" groups off hand.

Edited April 16, 2015 by lawmangr

[wblacksh]

No, my M&P is getting worn out a bit I think. All of my stats were shooting standing unsupported so my accuracy is not as good as using a bench rest

[thermobollocks]

at 173 powerfactor out of my open gun, accuracy at 50 yards is terrible. I cant even hit the 12 inch circle. The shots miss by several feet sometimes left right up and down in a random pattern. My dot is in the same place every shot.

I think the speed of major power factor with these degrades accuracy severely. I have about 2500 of them left and will use them up. I bought a bunch because of the price point. I plan to try something else when my stock runs out. My crimp seems to be correct after a few adjustments and tests.

Are you using these (124 RN) or these (124 RN HPCP)? Normal plated bullets often don't hold up past around the 1200 fps mark (depending on a bunch of stuff), but the heavy plate/concave base one is supposed to be better for high speeds. Xtreme recommends anything above 1200 fps you use the HPCB.

[wblacksh]

Hmm... Good point. I am using the regular RN not the hpcp. I should try those and see.

[wblacksh]

I remember reading that on their website now...