147 gr FP bullet question

[Chetc]

recently i purchased the Bayou 9mm 147gr FP, this bullet has the groove, before that i was shooting the SNS casting 147gr FP without the lube groove, these shot great with 3.2 or 3.0 if TG, for some reason maybe someone has been down this road, but i cannot get this bullet to group, at 25yds my groups opened up over 2" larger than the SNS no lube groove bullet, i hate to give up on the Bayou 147 FP bullet, any ideas why i cannot get them to work, i am shooting a Sig P320



Chet

 

[rcmodel]

What groove are you talking about??
Both the SNS and Bayou 147 appears to have the same grease grove.

As all cast bullets must have.

Your most likely cause of inaccuracy is too low velocity, not getting the heavy for caliber bullet going fast enough to stabilize.

Or not hitting it head enough with the powder charge to bump it up to fit the barrel.

rc

 

[Chetc]

hi RCModel

the SNS casting coated bullet does not have the lube groove, both the same type of bullet, i can take the powder chg up a bit, how much bullet jump do you think i should be loading at, right now i am loading them at 1.160 for my P320 and 1.140 for my wifes XDM, these have a very short throat. i am loading at approx .010 jump off the lands

Chet

 

[JamieC]

It's possible the two different bullets are quite a bit different hardness wise. ASSuming the BB bullets are harder than the SNS bullets, a stiffer powder charge might be needed to get the bullet to expand properly into the rifling, as RC was saying. Send Donnie, (owner, Bayou Bullets), an email, he'll get back to you quickly.

 

[MajorMagnetic]

If the Bayou bullet isn't as accurate as the S&S bullet, then just go back to the S&S. I've had to do that before. Not all bullets are created equal. Some are better than others.
HTH..............MM

 

[g.willikers]

Maybe it's the bullet diameter.
The 147 flat point lead bullet was always the most accurate for me, and for everyone else who tried it with my ammo, (trusting souls).
But in .357 diameter and chronographed at around 950f/s.
As for length, I loaded them the longest possible for smooth operation in the mags, and for passing the plunk test.
So they never actually got measured.
Lead bullets never seemed all that consitant to measure due to their rough surfaces and mold marks.
Just a thought.