Fast14riot
Gold $$ Contributor
Would there be any possible tuning discrepancies when using a magnetospeed for the initial velocity/charge weight ladder test? I know it will affect group testing, but with one shot vs velocity?
Magnetospeed and velocity ladder?
- Thread starter Fast14riot
- Start date
I have noticed only very little POI shift (if non at all) when using my V3 for load testing.
The group as a whole wont be effected but, the groups POI as a whole might change slightly if that makes sense.
The two barrels I attach mostly too are both 1.25 straight tubes so, that might play a part?
I like to see where I am at FPS wise especially in conjuction with Quickload to see if I am close to what I am exspecting.
I am thinking about making a rail that will attach the V3 too which then slides into my bottom of stock (both my .308 and 6br have it) using the european style anschutz mount thus eliminating any possible POI change. I see they even have a Facebook page dedicated to that kind of mod now.
I have been very pleased with the V3.
The group as a whole wont be effected but, the groups POI as a whole might change slightly if that makes sense.
The two barrels I attach mostly too are both 1.25 straight tubes so, that might play a part?
I like to see where I am at FPS wise especially in conjuction with Quickload to see if I am close to what I am exspecting.
I am thinking about making a rail that will attach the V3 too which then slides into my bottom of stock (both my .308 and 6br have it) using the european style anschutz mount thus eliminating any possible POI change. I see they even have a Facebook page dedicated to that kind of mod now.
I have been very pleased with the V3.
Last edited:
Not in my experience. I've shot ladders with and without the MS attached (same loads, same order, etc.) with several rifles and the conclusions were the same, even in cases where the POI was shifted somewhat. With an admittedly small sample, the POI shift appeared to be constant across the range. The rifles also had different barrel contours, from a 1.25 straight to a sporter contour. The ladder interpretations were the same, with and without the MS attached.
It depends.
I use my MagnetoSpeed to do my "barrel characterization." This is shooting 5 shots at each ladder level. I usually use 1% jumps in powder charges. I shoot the 5 shots per powder load in round robin fashion. For this test, I use the MS.
When I have the MV data, I use Excel to plot a curve of ES vs powder charge and do a polynomial curve fit to plot the "real" curve as if I had smaller load spacing. This test is based on longitudinal resonance (like an organ pipe) and is not effected much by a weight (MS) on the end of the barrel.
Next, I tune my tuner and for that, I do not use the MS as I am now shooting 2 shots , one with red marker on the bullet and one with red. The load differences is again 1% with the nominal being the load I determined above that had the smallest ES. I shoot two shots per tuner setting at 200 yd and go home and evaluate the data by plotting vertical dispersion vs tuner setting, again using Excel and the curve fit feature.
Now I have a tuner setting to start with at the 600 yd and/or 1000 yd, again with unequal charges for fine tune.
I use my MagnetoSpeed to do my "barrel characterization." This is shooting 5 shots at each ladder level. I usually use 1% jumps in powder charges. I shoot the 5 shots per powder load in round robin fashion. For this test, I use the MS.
When I have the MV data, I use Excel to plot a curve of ES vs powder charge and do a polynomial curve fit to plot the "real" curve as if I had smaller load spacing. This test is based on longitudinal resonance (like an organ pipe) and is not effected much by a weight (MS) on the end of the barrel.
Next, I tune my tuner and for that, I do not use the MS as I am now shooting 2 shots , one with red marker on the bullet and one with red. The load differences is again 1% with the nominal being the load I determined above that had the smallest ES. I shoot two shots per tuner setting at 200 yd and go home and evaluate the data by plotting vertical dispersion vs tuner setting, again using Excel and the curve fit feature.
Now I have a tuner setting to start with at the 600 yd and/or 1000 yd, again with unequal charges for fine tune.
Upgrades & Donations
This Forum's expenses are primarily paid by member contributions. You can upgrade your Forum membership in seconds. Gold and Silver members get unlimited FREE classifieds for one year. Gold members can upload custom avatars.
Click Upgrade Membership Button ABOVE to get Gold or Silver Status.
You can also donate any amount, large or small, with the button below. Include your Forum Name in the PayPal Notes field.
To DONATE by CHECK, or make a recurring donation, CLICK HERE to learn how.
Click Upgrade Membership Button ABOVE to get Gold or Silver Status.
You can also donate any amount, large or small, with the button below. Include your Forum Name in the PayPal Notes field.
To DONATE by CHECK, or make a recurring donation, CLICK HERE to learn how.