Moderator: MudBug
Rklenke wrote: Using 300 grain XTP over 32.2 LilGun.
Rklenke wrote:I have used both to the same result. I get no difference in velocity or point of impact between XTP and XTP mag. I was able to shoot some Hornady factory today and everything cycled fine three shots in a row. I threw in another 300 XTP and it cycled fine as well. I'm at a bit of a loss. I'm going to have to just continue to shoot it and see if I can find any trends.
Rklenke wrote:Interesting that you say 32.2 is a light load for a 300 grain as it is the max per Hornady. I haven't gone over the published loads, but if the pressure is as low as you say, it may be worth a slow work up. I'm already getting 2000 fps with 32.2.
The empty space in the case has made me nervous since day one reloading this caliber after reading quite a bit on "detonation". A full case fill would be reassuring.
Rklenke wrote:I'm interested in how you lapped the chamber, I will probably be doing some googling. My barrel/chamber is an 18" budget GLFA. It has given me 80-100 fps over published velocities both in reloading and with Hornady black. Here is a string of 300 grainers for reference. I've got quite a few more like this with averages from 1970 to 2000.
Description: 450BM 300 XTP mag 32.2 LG
Distance to Chrono (FT): 10.00
Ballistic Coefficient: 0.200
Bullet Weight (gr): 300.000
Shots
# FPS FT-LBS PF
6 1964 2569.92 589.20
5 1961 2562.08 588.30
4 1946 2523.03 583.80
3 1962 2564.69 588.60
2 1962 2564.69 588.60
1 1959 2556.85 587.70
Average: 1959.00
StdDev: 6.57
Min: 1946
Max: 1964
Spread: 18
True MV: 1970.14
Group Size (IN): 0.90
I use the Hornady taper crimp, seating to the cannelure (2.080 on the 300 XTP) and crimping to .476. The shorter COAL allows for perfect function from an unmodified pmag 10, which is nice.
Users browsing this forum: Google [Bot] and 6 guests