Quickload Help - .300 WSM + H4350

[moosehunter71]

Hi there,

I have two questions,

First - what is the maximum charge and velocity projected by Quickload for a 180g TTSX + H4350 in a .300 WSM (24 inch barrel - Rem M700).

Second - based on your experience, how accurate are Quickload predictions for max velocity (i.e., should I stop load development when Quickload max velocities are reached). The reason I ask is that I cannot find recent Barnes data for 180g bullets using H4350 (the Barnes#3 manual lists this powder, but I have found that Barnes #3 and Barnes #4 data don't match well for the same bullets weights and powder combinations). Thanks.

 

[Erik Cortina]

WORK UP TO THIS LOAD!
If you jump the bullet, 63 grains of H4350 seems to be the max load for 300 WSM with the 180 Barnes TTSX at about 3000 fps.

Quickload can be very accurate, but I would need to know alot more about your setup to make it that way. But I would not go beyound their max load anyways.

Hope that helps.

 

[moosehunter71]

Thanks X3M Hunter,

63.0 grains is where I was planning to stop - appears to be the max/near max load in my rifle (and perhaps slightly hot). I plan on chronying this load again - on the last attempt, only 1 of 3 shots were recorded (63.0g of H4350 = 2953 fps). If the average velocity turns out to be 2953, am I correct in assuming that QL would assume this is safe (barring the presence of any other high pressure indicators, that is).

What additional info would allow for more accurate QL predictions. I can provide info on headspace, bullet seating depth (.050 off lands), chamber length. Unfortunately, I could only provide a crude estimate of case volume (I have a cheap electronic scale that cannot weigh a case full of water - I would have to spill the water into the scale pan and weight that - I am sure that some water would remain in the case).

 

[Yellow11]

You can obtain water volume measurement by using a surgical syringe

 

[Erik Cortina]

Case overall lenght from base to tip would help. Also water volume and temperature when you shot over chronograph.

 

[moosehunter71]

X3M Hunter,

The case volume averaged 80.95 grains of water (ave. of 80.92, 81.0, and 80.92) in a resized case with a shoulder set back of .002" and trimmed to 2.090"). The OAL (base to tip) is 2.881" (or 2.250" to ogive). The temperature was 10 Celsius (50 Fahrenheit). The velocity was 2953 fps for 1 round (10 feet away from muzzle).

I don't know if this is relavant, but the chamber length is 2.128" and the headspace is .001" under the SAAMI minimum value (as measured using the RCBS precision MIC).

Thanks