jmden
Well-Known Member
Hi,
I'm in need of some advice/ideas in regards to some "issues" I'm having with my stock Rem. 700 LSS 300RUM. It's got about 170 rounds through it. Last year I worked up a load for it using 200g Swift A-frames and 94.4g RL25, (FED 215 primer and 3.677 COL using Sinclair bullet comparator because of magazine lenth) at just under 3100fps MV with little to no pressure signs. All Remington brass is carefully prepped by trimming, primer pocket uniforming, flash hole reaming, then weighing and sorting cases into the 1 grain lots.
This year I'm working up a load for the 200 Accubond. I've played with RL25, Retumbo, H870, AA8700, VV N560 and have settled for the moment on RL25 again with FED 215M primers. (BTW, is RL25 really temp insensitive?)
The other day I went to shoot over the Oehler chrono at the range with rounds from 93.0 to 95.0g of RL25 in .2g increments, hoping I would find a sweet spot of several sequential .2g increment increased rounds by noting several at the same or nearly same velocity--this is kind of shortcut of the "ladder method". I had ejector pin marks right away but velocities of about 3185fps MV with the 200g Accubond. (Hmmm...Why was I at 94.4g RL25 last year with the 200g Swift A-frame at an MV of just under 3100fps with little or no pressure signs?)
So, I went home and reloaded in .2g increments from 91.0 to 93.0g of RL25. Back at the range I got pressure signs again and velocities with the first couple of round at about 3125fps MV.
These cases have been mostly full-length resized using the +.010 Redding competition shellholder and die about 4 times (may have been neck sized only a couple of times as that seems to work just fine in my rifle) and shot about 3 times. It almost seems like that with each subsequent firing, pressure signs come on earlier and earlier. From my limited knowledge, this does not make sense. However, with my careful record keeping and with nearly every round fired over the Oehler and with most if not all conditions and parameters recorded...this data doesn't lie or there is some piece of the puzzle I'm missing. Arghhh! Bad brass? What is it?
It's quite difficult to come up with a consistently workable load when each subsequent firing seems to give different results. Ideas?
The barrel seems to copper foul pretty badly even though I did a regimented break-in procedure I read out of Sinclair's book. I still need to do several laborious rounds with Sweets and Shooter's Choice before no more blue comes out--even after only 4 or 5 rounds have been fired throught it. I finally gave in and had my way with the JB bore paste the other day in hopes of some improvement. Some folks swear by it and some folks are repelled by it--each seemingly equally qualified. Dan Lilja, for instance, hates JB but doesn't need it on his fine barrels. I've got a dime a dozen stock barrel--maybe it can make a difference on a cheap barrel, I don't know. ???
Thanks,
Jon Denham
I'm in need of some advice/ideas in regards to some "issues" I'm having with my stock Rem. 700 LSS 300RUM. It's got about 170 rounds through it. Last year I worked up a load for it using 200g Swift A-frames and 94.4g RL25, (FED 215 primer and 3.677 COL using Sinclair bullet comparator because of magazine lenth) at just under 3100fps MV with little to no pressure signs. All Remington brass is carefully prepped by trimming, primer pocket uniforming, flash hole reaming, then weighing and sorting cases into the 1 grain lots.
This year I'm working up a load for the 200 Accubond. I've played with RL25, Retumbo, H870, AA8700, VV N560 and have settled for the moment on RL25 again with FED 215M primers. (BTW, is RL25 really temp insensitive?)
The other day I went to shoot over the Oehler chrono at the range with rounds from 93.0 to 95.0g of RL25 in .2g increments, hoping I would find a sweet spot of several sequential .2g increment increased rounds by noting several at the same or nearly same velocity--this is kind of shortcut of the "ladder method". I had ejector pin marks right away but velocities of about 3185fps MV with the 200g Accubond. (Hmmm...Why was I at 94.4g RL25 last year with the 200g Swift A-frame at an MV of just under 3100fps with little or no pressure signs?)
So, I went home and reloaded in .2g increments from 91.0 to 93.0g of RL25. Back at the range I got pressure signs again and velocities with the first couple of round at about 3125fps MV.
These cases have been mostly full-length resized using the +.010 Redding competition shellholder and die about 4 times (may have been neck sized only a couple of times as that seems to work just fine in my rifle) and shot about 3 times. It almost seems like that with each subsequent firing, pressure signs come on earlier and earlier. From my limited knowledge, this does not make sense. However, with my careful record keeping and with nearly every round fired over the Oehler and with most if not all conditions and parameters recorded...this data doesn't lie or there is some piece of the puzzle I'm missing. Arghhh! Bad brass? What is it?
It's quite difficult to come up with a consistently workable load when each subsequent firing seems to give different results. Ideas?
The barrel seems to copper foul pretty badly even though I did a regimented break-in procedure I read out of Sinclair's book. I still need to do several laborious rounds with Sweets and Shooter's Choice before no more blue comes out--even after only 4 or 5 rounds have been fired throught it. I finally gave in and had my way with the JB bore paste the other day in hopes of some improvement. Some folks swear by it and some folks are repelled by it--each seemingly equally qualified. Dan Lilja, for instance, hates JB but doesn't need it on his fine barrels. I've got a dime a dozen stock barrel--maybe it can make a difference on a cheap barrel, I don't know. ???
Thanks,
Jon Denham
