Originally Posted by bpwsm
AH...back from the range and having a beer!
Yeh I know!!!!!!!....But I think that with the length and design of this bullet (3 bands etc.) combined with seating it out a bit farther produced these velocities. An anomaly??? I can't say for sure. But there were absolutely NO pressure signs that we could see. I will have our very reputable gunsmith give a non-informed visual just to be certain! Ialso could not visibly see any indication of "tumbling" clean holes straight away! I could only test @ 100mtrs. as the 200mtr. was under repair so I'm not sure if the bullet had enough distance vs velocity to truly characterize stabalization.
To verify that the crono was working properly I fired some factory Barnes Vortex 150grn. ammo that came out to be right @ 2800 fps..and is listed to be@3060 also Winchester Supreme 150 grn. btips just above 2900 ..apples to apples.
Yea, I know!!! Trying out the 140 TSX in 7mm RM with 62.3gr IMR4831, I kind of freaked when I saw the chrono indicating 3250. Adjacent charges varied (average) as expected. Standard Hdy 139 BTSPs were going 3050 at this charge so I thought my chrono was playing tricks on me. But other loads from other guns were about as expected, including factory loads.
No over pressure signs, though somewhat flattened primers. I'm on my 5th reload of these Fed cases and primers are still reasonably secure and no stretch marks near the case head. No stiff bolt. The Barnes produced very tight groups, ranging from .1"x.6" to .6 x .6 on a 80 degree, 5 - 20 mph wind day.
Now that I experienced these shooting so well, I bought some 140 TTSX and 145 LRX to try out next. I'm not sure about going down to 120s because of the increased speed causing excessive barrel wear, and on game too much bloodshot meat (unless I download them, but then I know from general experience with them Barnes are more accurate driven at near max speeds). One reason I like the Barnes to begin with is their knockdown performance and relatively contained meat damage.
Off topic, but anyone out there with any experience with the 120 TTSX out of a 7 RM on deer? Jeesh my 243 with an 85gr TSX @ 3200 will take a deer under 300 yards.