Sunday 25 December 2011

Weight test on airgun pellets - Air-Arms Diabolo and H&N Finale Match

 To evaluate quality control on top brand airgun pellets - in particular with the goal of using (or not) this procedure to sort pellets for extreme precision Benchrest 25 Air Rifle match competition, I took a sample of 50 pellets from Air-Arms Diabolo 4,5mm and weighted them. I decided to use a sample of 50 pellets from Haendler & Natermann (H&N) Finale Match Air Pistol High Speed 4,5mm as a cross reference for quality control accross diferent manufacturers / different pellet types.

Please note that both Air-Arms and H&N pellets are around 8 or 9 GBP per each tin of 500 units - a "mental note" that this about 1/10 of the price of equivalente .22 LR ammunition.


Average, Maximum, Minimum and Standard Deviation


Histograms


Sunday 18 December 2011

Rowan Engineering Custom Turret for Nikko Diamond 10-50x MK.I

After finding out that the custom scope elevation turret by Rowan Engineerring Ltd (UK) for the Nikko Stirling Diamond 10-50x scope (that I use on my Air-Arms EV2 MK.II Field Target / Benchrest setup), was designed only for the new version (MK. II, 27 mm diameter) of this scope, I was lucky enough to get Rowan's custom shop support, trough Derek Rose, and to get it modified to fit the previous, slightly larger, version (MK. I , 28,5 mm diameter).


The fitting and anodized external finish are absolutely "luxury" grade. Fits like a glove. Thank your Derek Rose for all the support! On the side of the turret - the custom large focus sidewheel (and "matching" pointer) also a custom work by Rowan Engineerring Ltd (UK) .

My draft drawing for dimensions sent to Rowan Eng.
for the MK.I Nikko Diamond  10-50x turret "re-fit work"



Sourcing high grade silex stones for flintlocks

Helping a fellow national shooter, M. Cruz, sourcing high grade silex stones for his new MLAIC competition muzzleloader flintlock pistol, a Arsa, made in Spain, .45 caliber, "Manton" model, I came across the recommendation from this Spanish manufacturer for F. Javelot (France). The Arsa Manton pistol uses 5/8 " stones (15 x 18 mm) such as the one shown on the photo on the left.

Specs and price list by F. Javelot for flint stones - 2011


Additional research also pointed another strong recommendation towards the "old school guru" of flint stones - highly rated within the demanding MLAIC competition shooter community, Jean-Jacques Dutrieux (France) . The similitude between the tables, and the common French nationality, make me believe that F. Javelot is a dealer for Dutrieux products.





Billinghurst MLAIC training sessions

Across the last two Saturdays, December 10th and 17th, 2011, I invested some quality time training with my black powder muzzleloader in .36 caliber, a Billinghurst by custom German gun maker Tilo Dedinski. The 2012 Portuguese MLAIC matches are only 7 weeks away and training is essential.

Billinghurst .36 caliber and a training score of 93 / 100
(MLAIC Kucheneuter score rules sort the best 10 out of 13)
Loads setup details (in use order):


Yesterday, right on the last target at the Jamor shooting range (Dafundo, Oeiras, Portugal), I broke my personal training record for the MLAIC Kuchenreuter discipline, with 93 / 100 points - my previous record was 92 / 100 from a January 2011 training session .
Score is made from the 10 best out of 13 shoots, at the ISSF 25 meter pistol target, and a >50% inside the ring is required to score inward (not as in ISSF where touch ring scores inward) - all under a 30 minutes match time constraint.

Targets from the training session Dec. 10th :


Targets from the training session Dec. 17h :




Close up on the 9-10 ring from the 93 / 100 target.
On the 10-X ring, there are 3 impacts
- the lower  "insertion" is a 2-in-1

Scores in detail:

Dec. 10th, 2011
Target I:     7 8 8 | 8 8 8 8 8 9 9 9 9 9 10 , Scores: 86 / 100
Target II:    0 5 7 | 7 8 8 8 9 9 9 10 10 10 , Scores: 88 / 100

Dec. 17th, 2011
Target I:    4 6 7 | 8 8 8 9 9 9 9 9 9 10 , Scores: 88 / 100
Target II:   8 8 8 | 8 9 9 9 9 9 10 10 10 10 , Scores: 93 / 100

Please note that MLAIC scores only the best 10 out of the 13 match impacts. 

Original leather sling "Arsenal do Exército" for the Mauser Vergueiro

Detail on the back section
- with one leather loop holder and brass buckle.
Note the "A.E." engraving on the leather
Back in September, 2011, with the help of Brian from Bryburn Trading Co Pty Ltd, an Australian (St. Peters, New South Wales) vintage "militaria collectable" dealer,  I managed to get hold of one original Portuguese Mauser Vergueiro leather sling (originated from the units that Portugal sold to Brazil) - complete with all the original brass elements (buckle and button/stud) and the leather loop holder.

Now, from the same dealer, I managed to get an even more accurate original - also complete with leather loop and the brass elements but with a special "extra": the "A.E". engraving on the back leather section. The acronymous stands for "Arsenal do Exército [Português]", that translates to "[Portuguese] Army Arsenal". Considering it is an original vintage piece, it is in great condition and in perfect working order condition.

The sling at the maximum extension - approx. 1 meter (3,2 feet)

I used it on the October 2011 Portuguese Shooting Federation Vintage Military Weapons Match - and reached the second place on the rifle match, with 179 / 200 points (an average of 9 / 10 score for each of the 20 match shoots). The use of a sling on this match, shooting prone at a 100 meter distant target, "locks" the rifle around the supporting left arm -  critical to ensure accuracy .


Overall view - Mauser Vergueiro (8x57 IS), m/1904/39, with leather sling

Sling dimensions:
  • Overall maximum usable lenght: approx. 98 centimetres
  • Thickness: 3 millimetres
  • Width: 2,5 centimetres
  • Round front brass stud diameter: 9,3 millimetres
  • Back brass buckle long: 2,5 centimetres
  • Leather loop width: 1,25 centimetres

Detail on the external side of the back section brass buckle
and leather loop holder


Detail on the front section with the brass stud