Modifying shop bought arrows

[NorthernRaider]

My finding are thus, the modified arrow has much greater penetration than the original training arrow by about 50%, But its not as accurate I can get 4 to 5 inch groups with the training arrow as bought but I'm getting up to 8 or 9 inch groups with the modified arrows.
Still good enough for PA security duty though !!!

However I also tried using my arrows from my recurve bow which are Easton Blues XX75 alloy1816 arrows, these come with heavier alloy target points which are nicely sharp, that are inserted into the arrow shaft rather than slid over, and these worked superbly. They appear faster and more accurate because they are lighter and more streamlined. The blues penetration was superior to the training arrows but slightly inferior ( not by much) to the modified arrows, but much more accurate.

Weight wise the
Eastons are 23 grams
Petron Fibreglass are 33 grams
and the modified arrows are 36 grams

So the ready made middle price arrows appear to offer the best all round package of speed, quality, accuracy and penetration