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  1. S

    BC Variation bullet to bullet is real, and its a problem.

    My experience has been the average BC drops with barrel wear, and the shot to shot variation within a string rises as the barrel reaches the end of it's life. Both can happen before 100 yard groups open up, but it takes longer than just looking at the throat would suggest. It's a fundamental...
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    Gunsmithing 6.5mm-270WSM

    270 and 300 wsm have the same headspace, it's shorter than the 7 wsm. A 6.5/270 wsm is about half way between a 300 WinMag and a 300 Norma on overbore, so the barrel life will be in that range. Probably more in the Norma direction. I shoot a 7/300 wsm a lot using 270 brass. Necking up from...
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    New Ruger RPR's - Magnum options

    Good to hear stuff is becoming available for the RPR Magnum. The trick to getting the barrels loose is a big hammer on the wrench rather than just pulling on it. The wrench needs to be stout to be treated like that. The RPR Magnum barrel shank is 1.200", so I bored a set of oak blocks for it...
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    New Ruger RPR's - Magnum options

    The RPR Magnum barrel nut uses the same AR15 spline setup, but that LRI wrench won't work because the handguard nut threads ahead of the splnes are too large. I bored a Brownells AR15 wrench to get mine off. The Magnum RPR has been out awhile now, so you might call LRI to see if they have...
  5. S

    300 Norma Mag

    And $20/100 cheaper than Peterson
  6. S

    30-338 LM AI

    Flatlines and N570 will feed the speed monkey......
  7. S

    30-338 LM AI

    The Surgeon XL in an AICS is my current dream gun. I just need to figure out what cartridge. The current Midway sale on Lapua 338 Lapua brass for $80/100 has sucked all the joy out of my 300 Norma. I won the first URSA 2K match with a 1:10 300wm using the 230 Hybrids. The DA was ~4000'. The...
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    30-338 LM AI

    I'm testing one. It's a little more overbore than a 28 Nosler, less than a 26 Nosler. You can take a guess at barrel life from that. This one is at 120 grains of water for case capacity. Depending on the reamer, it could be a few grains higher. I'm guessing that with maximum seating length...
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    The new 33XC & 37XC cartridges designed by David Tubb

    I think it's unusual to have the bullet weight, remaining case capacity, and bullet jump to line up like this. At the end of the day though, it's only a comparison between just one of the Flatlines and one jacketed bullet with a single powder that probably favors the jacketed bullet. A...
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    The new 33XC & 37XC cartridges designed by David Tubb

    I've had tight resizing with higher pressure loads. Backing off the load took care of it. The loads in post #235 had difficult sizing with both bullets at 123 grains and with the jacketed bullet at 121 grains. The die was scraping the lube off creating a dry ring on the case. Stopping the...
  11. S

    The new 33XC & 37XC cartridges designed by David Tubb

    2x fired 33xc brass, 215M, VV 24N41, 285 ELDm @ 4.180" and 285 Flatline @ 4.505", both bullets just touching the lands. The purpose of this test was to generate information on the use of VV 24N41 as a H50bmg substitute and to compare the start pressures of the solid and jacketed bullets. The...
  12. S

    The new 33XC & 37XC cartridges designed by David Tubb

    I also use Imperial Sizing wax. The 338 Lapua chamber has a .0215"/" case taper. The 33XC only has .009"/", so it's a different animal. The reloading area was nearly 100 degrees when I sized the cases. The sizing wax was pretty runny, which may have contributed to the problem. I agree that...
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    The new 33XC & 37XC cartridges designed by David Tubb

    My first experience with N570 was bad. I was testing the benefits of using temperature sensitive powders on cold days in a 300wm. I started with best practices for my standard H1000 load, which included the use of a standard large rifle primer. It was about 35 degrees. I'd taken several...
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    The new 33XC & 37XC cartridges designed by David Tubb

    The reason I started with the 33xc is it was a cheap way to generate some experience with a variety of solid bullets. The 338 caliber allows a direct comparison between a variety of both jacketed and solid bullets. The idea was to start with a jacketed bullet load that was presumed to be...
  15. S

    The new 33XC & 37XC cartridges designed by David Tubb

    QuickLoad dangerously over estimates the charge weight for N570 for the combination used in the pressure ladders documented above. I'm not trying to be obtuse or confrontational, I just wanted to put that front and center before we have a conversation that's going to put half the internet to...
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    The new 33XC & 37XC cartridges designed by David Tubb

    30" 1"9.3 Bartlein, once fired neck turned Tubb brass, 256 Warner at 4.440" oal (touching the lands), 215M, N570. 112, 113, 114, 115 grains. I used the solid bullet reamer spec with a few thou taken out of the neck diameter. 60 rounds down the barrel when these started. Air temperature was...
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    300 WSM or 7-300 WSM Advice

    I shoot a 7/300wsm as my ELR practice gun. Necking up Norma 270wsm brass from 0.277 to 0.284 barely qualifies as a wildcat. I've tested the 195 class 7mm bullets. The 180s are more consistent and score better with an 8 twist. QL suggests that moving from a max length with 180 grain bullets...
  18. S

    198 Flatlines in 300win mag

    Alan, I know that load was hot, that's why I posted the case life. It has nothing to do with the bullet and everything to do with how much powder I decided to use. 3-4 loading pressures aren't uncommon for ELR competition loads. Those pressures can also settle down the velocity spreads...
  19. S

    198 Flatlines in 300win mag

    R26 gives remarkable performance, but watch out on hot days. The max load listed in the Warner data would be very hot in my gun. H4831sc gives good performance and is more temperature stable. The Warner data is from QuickLoad and has not been tested. It also doesn't give all the information...
  20. S

    Gunsmithing Chamber Reamer Not Clearing Chips

    It's a cheap whole house water filter on the suction side. This one was on clearance and being able to switch to the second filter isn't needed. The flows for this system are so low and short that a single filter intended for a house is overkill. The primary filter is the magnets that hold...
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