Winchester pre-'64 model 70 hunter grade

December 3, 2008

Case

Case
Length

Powder

Grains

Primer

Bullet

C.O.L.

Ft/Sec

Temp.

Yardage

Shots

Group
Size

Win SX

2.190

Varget

BR2

Nos 69gr CC

2.805

2841 av

133

31.6

100

3+1

1.944

Win SX

2.190

Varget

BR2

Nos 69gr CC

2.805

2984 av

58.87

32.6

100

3.187

Both of the loads shot on this date keyholed horribly. The 69 gr bullets were too much for the 1:14" twist to handle. Will load up some 52gr AMAXes and Matchkings and see how they shoot during the next decent range session.

February 16, 2009

More load testing, with two different match grade bullets, both 52 gr. The conditions were stable, with the temperature hovering @ 25.1 degrees F with gusty winds present. Both groups were fired @ 100 yds. Cold bore was not included in the measurement of second group. BC C.O.L. stands for the measurement taken with the Hornady Bullet Comparator caliper attachment. All the velocity measurements for this date are listed as shown in the manual, no actual chrony readings were taken.

Case	Powder	Grains	Primer	Bullet	C.O.L.	BC C.O.L.	Ft/Sec	Shots	Group Size
Win SX	Varget	33	BR2	Hor 52gr AMAX	2.7500	2.3575	3350 th	4	1.338
Win SX	Varget	33	BR2	Sie 52gr SMK	2.6725	2.3200	3350 th	3+1	1.497

Groups were not impressive. I will try lengthening the C.O.L., and loading a hotter charge under 52 gr. Speer HPs.

February 25, 2009

Continued load testing with 52 gr. Speer HPs and Varget. The conditions were optimum, with a very light to no breeze, and a temperature of 33.1 degrees F. All groups were fired @ 100 yds. Actual chronograph readings were taken, with ES standing for extreme spread. The only variation used between the three groups was overall length. The listed velocity for these charges was 3650 fps.

Case	Case Length	Headspace	Powder	Grains	Primer	Bullet	C.O.L.	Ft/Sec	ES	Shots	Group Size
Spr Spd	2.196	1.800	Varget	36.4	BR2	Spe 52gr HP	2.6800	3591 av	98.7	3+1	0.259
Spr Spd	2.196	1.7975	Varget	36.4	BR2	Spe 52gr HP	2.6065	3537 av	69.16	3+1	0.823
Spr Spd	2.196	1.800	Varget	36.4	BR2	Spe 52gr HP	2.6600	3575 av	83.05	3+1	1.0615

3-shot group @ 100 yds: 0.259"

C.O.L. made a major impact on group sizes, it also made a difference in velocity, with longer C.O.L. producing higher velocities. 0.259" is a pretty dang good group, for a rifle that the throat is shot out in and only has a 10x Lyman Super Target Spot scope on it. I will continue to test, but everything will be based off of this load. This is not going to be a serious hunting rifle anyway, that's what my 22-250 Rem. is for lol.

Cold bore is about 0.5" to the right of group. A dime is used for reference.

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